Willis Tower

Willis Tower is a 110-story, 1,450-foot-tall building (1,730 feet counting its twin antennas) on the southwest side of downtown Chicago. Willis Tower, finished in 1973 and known as Sears Tower until 2009, attracts an estimated 25,000 visitors daily. In 2013, the Council on Tall Buildings and Urban Habitat ruled that the exposed steel mast on the 104-story 1 World Trade Center in Manhattan, N.Y., should be considered a spire, not an antenna, making its official height 1,776 feet. The ruling means that Willis Tower would be unseated as the nation's tallest building.

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